Persistent fatigue without exertion, speaking feels like an effort, a declining appetite with bloating after small meals, loose stools, a heavy dragging sensation in the lower abdomen — and in some cases, prolapsed organs, persistent low-grade fever that antibiotics cannot touch, or spontaneous sweating with a craving for warm drinks. In TCM, all of these trace back to one root cause: Spleen-Stomach Qi Deficiency with Middle Qi Sinking (脾胃气虚、中气下陷). The Jin dynasty physician Li Dongyuan, observing thousands of debilitated patients amid the chaos of war, developed Bu Zhong Yi Qi Tang — celebrated for centuries as the "Chief Formula for Tonifying Qi and Raising Yang." (Hai Tian - Bu Zhong Yi Qi Tang | Nong Ben Fang - Bu Zhong Yi Qi Tang)
I. Origins: Li Dongyuan and the Spleen-Stomach School
Bu Zhong Yi Qi Tang was first recorded in Li Dongyuan's Nei Wai Shang Bian Huo Lun (Jin dynasty, 13th century), the foundational text of the Pi Wei (Spleen-Stomach) School. Li Dongyuan observed that his era's prevailing physicians misused cold-bitter herbs to treat the fatigue and low fever of war-depleted patients — further damaging Spleen-Stomach function. His counter-theory: "The Spleen-Stomach is the Postnatal Root; all Qi and Blood originate here." He coined the principle "sweet-warm herbs clear great heat" — meaning that deficiency-fever arising from Qi collapse responds not to cooling herbs but to warming Qi tonics. Bu Zhong Yi Qi Tang is the clinical embodiment of this theory, later earning the honorific Yi Wang Tang ("King of Medicine Decoction").
Core pathomechanism: The Middle Jiao (Spleen and Stomach) is the body’s Qi-generating engine. Spleen Qi rises to lift the organs, generate Blood, and consolidate the surface; when it is depleted by irregular diet, overwork, prolonged illness, or emotional strain, three interconnected problems emerge simultaneously: (1) Digestive dysfunction — poor appetite, bloating, loose stools, fatigue; (2) Middle Qi sinking — the organs lose their upward support, producing prolapse (rectum, uterus, stomach), dragging lower abdominal sensations, urinary incontinence, and prolonged menstrual bleeding; (3) Deficiency-fever — collapsed Yang Qi stagnates and generates heat from below, producing persistent low fever with spontaneous sweating and a desire for warm drinks — completely unresponsive to antibiotics or cold-bitter herbs. The formula’s strategy: supplement the Middle and raise Yang, restoring the Spleen’s upward-moving force to resolve all three simultaneously.
II. Formula Composition
Eight herbs — as the formula song says: "Bu Zhong Yi Qi uses Huang Qi and Zhu with Chen Pi; Sheng and Chai, Ren Shen, Gan Cao, and Dang Gui body; excelling at deficiency-taxation internal injury; also treats Yang-deficient external cold.”
| Herb | Classical dose | Modern dose | Role & Function |
|---|---|---|---|
| Huang Qi 黄芪 (Astragalus) | ~18g | 15–30g (up to 60g) | Chief — supplements Middle Qi, raises sunken Yang, consolidates the surface and stops sweating |
| Ren Shen 人参 (Ginseng) | ~6g | 6–10g (or Tai Zi Shen 30g) | Deputy — greatly supplements Source Qi and Spleen-Lung Qi; enhances Huang Qi’s tonifying effect |
| Bai Zhu 白术 (Atractylodes) | ~6g | 10–15g | Deputy — strengthens Spleen, dries Dampness; relieves bloating and loose stools |
| Zhi Gan Cao 炙甘草 | ~9g | 6–9g | Deputy — supplements Middle Qi, harmonises all herbs; moderates the formula’s warming nature |
| Dang Gui 当归 (Angelica) | ~6g | 10–12g | Assistant — nourishes and activates Blood; addresses Qi-deficiency-induced Blood deficiency; prevents stagnation |
| Chen Pi 陈皮 (Tangerine peel) | ~6g | 6–10g | Assistant — regulates Qi, harmonises Stomach; prevents tonics from causing stagnation ("supplement without stagnating") |
| Sheng Ma 升麻 (Cimicifuga) | ~6g | 3–6g | Envoy — raises sunken Yang; guides Qi upward; the formula’s lifting force for prolapse |
| Chai Hu 柴胡 (Bupleurum) | ~6g | 3–6g | Envoy — raises Shaoyang clear Qi; guides herbs to the Middle Jiao; works with Sheng Ma to lift the sinking Middle |
Formula logic: The four chief-deputy herbs (Huang Qi, Ren Shen, Bai Zhu, Zhi Gan Cao) form the "sweet-warm Qi-supplementing core," restoring the Spleen’s generative capacity. Dang Gui nourishes Blood so that Qi has a vehicle; Chen Pi moves Qi so tonics do not create stagnation. Sheng Ma and Chai Hu are used in deliberately small doses — their role is purely to guide and lift, not to disperse. The Ben Cao Gang Mu notes: "Sheng Ma raises the clear Qi of Yangming; Chai Hu raises the clear Qi of Shaoyang — these are the most essential guiding herbs for constitutionally weak patients with depleted Source Qi." Critically, Sheng Ma and Chai Hu must not be overdosed, or they will consume Yin fluids and cause dryness.
III. Who This Formula Suits
Self-assessment — check 3 or more:
- Constitution: Qi-deficient — chronic fatigue worsened by activity, speaking feels effortful, spontaneous sweating, poor resistance; pale tongue with thin white coating, soft deficient pulse
- Digestive: poor appetite, bloating after small meals, loose stools, sallow complexion
- Sinking signs: dragging heaviness in the lower abdomen, rectal prolapse, uterine prolapse, gastric ptosis, or prolonged scanty menstrual bleeding
- Deficiency-fever: persistent low-grade fever with spontaneous sweating and a craving for warm drinks — unresponsive to antibiotics or cooling medicines
- Triggers: irregular diet, chronic overwork, post-illness or postpartum debility, prolonged mental strain, post-surgical recovery
Modern clinical applications:
- Digestive: chronic gastritis, chronic enteritis, functional dyspepsia, loose stools — for Spleen Qi deficiency patterns
- Organ prolapse: rectal prolapse, uterine prolapse, gastric ptosis, renal ptosis — this is the formula’s signature application; it is the standard base formula for Middle Qi Sinking
- Post-oncology recovery: post-surgical and post-chemotherapy fatigue, poor appetite, low-grade fever, spontaneous sweating; Grand Master physician Wang Xixing frequently used this formula as the base in oncology, commonly prescribing Huang Qi up to 60g
- Gynaecology: uterine prolapse, prolonged menstrual bleeding, postpartum Qi deficiency, urinary retention, threatened miscarriage — Spleen Qi deficiency patterns
- Sub-health: chronic overwork fatigue, easy cold susceptibility, poor energy recovery; also: unexplained persistent low fever, myasthenia gravis, chronic hepatitis, ptosis, and paralytic strabismus — all with confirmed Spleen Qi deficiency patterns
IV. Contraindications & Safety Notes
- Active cold or fever from external pathogen — using this formula during an acute infection will "close the door and trap the pathogen," worsening the condition; wait until fully recovered
- Hypertension (acute phase) — the Yang-raising action may elevate blood pressure; use only with practitioner supervision in stable hypertension
- Bleeding tendency — gum bleeding, nosebleeds, skin bruising; the Qi-raising action may aggravate haemorrhagic conditions
- Yin deficiency with Interior Heat — burning palms, night sweats, red tongue with scanty coating; the warming nature of this formula will aggravate heat signs
- Allergy to any ingredient
- Compatibility note: Do not combine with Li Lu (藜芦, Veratrum root) — classical incompatibility (Shi Ba Fan)
Usage notes: Take warm on an empty stomach (or 30 min before meals) for best absorption. Patent pill form (Bu Zhong Yi Qi Wan): 10–15g, 2–3 times daily with warm water or ginger tea. Avoid cold, raw, oily, and spicy foods; avoid alcohol and coffee. Rest adequately; avoid overexertion. Gentle walking or Tai Chi is appropriate. Do not combine with cold-bitter herbs (Huang Lian, Huang Qin) or Yin-nourishing herbs (Mai Dong, Sheng Di) without practitioner guidance, as these counteract the formula’s warming-lifting action.
V. Dosage & Clinical Modifications
As decoction: All eight herbs in 700ml water; soak 30 min, bring to boil, simmer 20–30 min to ~400ml. Strain; take warm in two doses, ideally on an empty stomach. Daily tea option: Huang Qi 10g + Dang Shen 10g + Bai Zhu 10g + Chen Pi 6g decocted as tea — convenient for mild Qi deficiency in busy individuals.
Common clinical modifications (practitioner-directed only):
- Severe Qi deficiency, marked fatigue: increase Huang Qi to 60g; add Dang Shen or Tai Zi Shen
- Pronounced prolapse (rectal, uterine): increase Sheng Ma; add Zhi Ke to support lifting
- Abdominal pain: add Bai Shao to soften Liver and relieve cramping
- Headache and dizziness: add Man Jing Zi, Chuan Xiong
- Cough and shortness of breath: add Wu Wei Zi, Mai Dong
- Prominent bloating and Qi stagnation: add Mu Xiang, Zhi Ke
- Damp heaviness and loose stools: add Cang Zhu, Fu Ling
- Qi-deficient external cold (weak person with cold): add Su Ye, Fang Feng to release exterior without further depleting Qi
VI. Clinical Cases (Grand Master Physician Verified Cases)
Case 1 — Cancer-related fever (Qi-deficiency fever, post-chemotherapy): Female, 43, cardia cancer post-surgery and 8 cycles of chemotherapy. Twenty days of afternoon low-grade fever (37.1–37.5°C) unresponsive to antibiotics (cephalosporins). Accompanying symptoms: profound fatigue, lumbar soreness, light sleep. Tongue: pale red, thin; pulse: thin rapid deficient. Diagnosis: Spleen Qi Deficiency with Qi-deficiency fever (升降不和, Ying-Wei disharmony). Treatment (Grand Master Wang Xixing’s modification): Sheng Huang Qi 60g, Tai Zi Shen 30g, Sheng Ma 6g, Chai Hu 10g, Dang Gui 10g, Chen Pi 10g, Bai Zhu 15g, Jiu Nu Zhen Zi 30g, Mo Han Lian 30g, Shi Chang Pu 15g, Zhi Yuan Zhi 20g, Sheng Gan Cao 6g. 20 doses. After 20 doses: fever resolved, temperature normalised without antibiotics, sleep improved, fatigue eased. At follow-up visit Huang Qi reduced to 30g and adjusted formula continued for 14 doses; fatigue and lumbar soreness further improved, emotional state stabilised. Long-term quality of life significantly enhanced.
Case 2 — Uterine prolapse (Middle Qi sinking): Female, 52, uterine prolapse 2 years post-childbirth. Symptoms: lower abdominal dragging sensation, fatigue, effortful speech, poor appetite, loose stools; prolapse worsened with exertion. Tongue: pale, white coating; pulse: soft deficient. Topical treatments had been ineffective. Diagnosis: Spleen Qi Deficiency with Middle Qi Sinking. Treatment: Bu Zhong Yi Qi Tang modified — Huang Qi 30g, Ren Shen 10g, Bai Zhu 15g, Zhi Gan Cao 6g, Dang Gui 12g, Chen Pi 10g, Sheng Ma 6g, Chai Hu 6g, Zhi Ke 10g, Shan Yao 15g; combined with pelvic floor exercises; activity restricted. After 1 month: dragging sensation markedly improved, prolapse degree reduced, fatigue, appetite, and stools improved. After 2 months: prolapse essentially resolved, all symptoms cleared. Follow-up at 3 months: no recurrence, constitution clearly strengthened.
Conclusion
Bu Zhong Yi Qi Tang represents Li Dongyuan’s most enduring contribution to TCM: the insight that the Spleen-Stomach is not merely a digestive organ but the root of all Qi, Blood, and organ support in the body. Its eight-herb composition — supplementing without stagnating, raising without drying, nourishing Qi and Blood simultaneously — addresses the full triad of Spleen Qi deficiency: poor digestion, organ prolapse, and deficiency-fever. For the millions today depleted by overwork, poor diet, and post-illness or post-surgical debility, it remains one of TCM’s most clinically versatile and important formulas. It is only effective for Qi deficiency patterns; Yin-deficiency heat, excess Interior Heat, and Damp-Heat patterns require different approaches. Always confirm your pattern with a licensed TCM practitioner before use.
